參數(shù)資料
型號(hào)： FT232RL
廠商： Electronic Theatre Controls, Inc.
英文描述： Incorporating Clock Generator Output and FTDIChip-ID Security Dongle
中文描述： 納入時(shí)鐘發(fā)生器輸出和FTDIChip標(biāo)識(shí)安全適配器
文件頁(yè)數(shù)： 25/29頁(yè)
文件大小： 471K
代理商： FT232RL
FT232R USB UART I.C. Datasheet Version 1.04
Future Technology Devices International Ltd. 2005
Page 25
8.3 USB to RS422 Converter Configuration
FT232R
100nF
3V3OUT
VCCIO
NC
RESET#
NC
+
100nF
10nF
Vcc
TXD
RXD
RTS#
CTS#
DTR#
DSR#
DCD#
RI#
CBUS0
CBUS3 -
PWREN#
CBUS2
CBUS1
USBDP
USBDM
VCC
1
2
3
4
5
OSCI
OSCO
CBUS4 -
SLEEP#
Ferrite
Bead
+
4.7uF
SHIELD
RS422 LEVEL
CONVERTER
Vcc
120R
6
9
10
4
5
2
3
SP491
11
12
7
RS422 LEVEL
CONVERTER
Vcc
120R
6
9
10
4
5
2
3
SP491
11
12
7
TXDM
TXDP
RXDP
RXDM
RTSM
RTSP
CTSP
CTSM
A
G
N
D
G
N
D
G
N
D
G
N
D
T
E
S
T
SHIELD
GND
DB9M
TXDP
RTSM
RTSP
Vcc
Figure 17 -Example USB to RS422 Converter Configuration
Figure 17 illustrates how to connect the UART interface of the FT232R to a TTL – RS422 Level Converter I.C. to
make a USB to RS422 converter. There are many such level converter devices available – this example uses Sipex
SP491 devices which have enables on both the transmitter and receiver. Because the transmitter enable is active
high, it is connected to a CBUS pin in SLEEP# configuration. The receiver enable is active low and so is connected
to a CBUS pin PWREN# configuration. This ensures that both the transmitters and receivers are enabled when the
device is active, and disabled when the device is in USB suspend mode. If the design is USB BUS powered, it may be
necessary to use a P-Channel logic level MOSFET (controlled by PWREN#) in the VCC line of the SP491 devices to
ensure that the USB stand-by current of 500μA is met.
The SP491 is good for sending and receiving data at a rate of up to 5 Megbaud – in this case the maximum rate is
limited to 3 Megabaud by the FT232R.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
FT232RL R 制造商:Future Technology Devices International Ltd 功能描述:UART, 28 Pin, Plastic, SSOP
FT232RL-2000 制造商:FTDI 制造商全稱:FTDI 功能描述:USB UART IC - Single chip USB to asynchronous serial data transfer interface
FT232RL-BO 功能描述:界面開發(fā)工具 FT232RL USB to UART Breakout Board RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評(píng)估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V
FT232RL-R 制造商:Future Technology Devices International Ltd 功能描述:UART, 28 Pin, Plastic, SSOP
FT232RL-REEL 功能描述:USB 接口集成電路 USB to Serial UART Enhanced IC SSOP-28 RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20
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